This forum has given me a lot over the years, and I've never had much to contribute. Now with this new car (my first since 2007) I discovered that eliminating the backup beeper requires the OBD2 thing. It took a while to find the port, even with my best googling skills, so when I found it I thought I'd contribute this. Note, for this photo my phone was flat on the floor. The port is on the underside of the dash, not pointing outward as on some models. 2021 Prius OD2 Port Location by Dave deBronkart posted Apr 2, 2021 at 9:16 PM
Update: after posting this, I found other posts e.g. Exactly where is the OBD2 interface socket on my new 2018 Prius Prime Adv? | PriusChat with the same basic answer for other years. But maybe this thread title will help others find it someday...
